#define ERR_NICKNAMETOOLONG_MSG "432 %s %s :Nickname too long, max. %u characters"
#define ERR_FORBIDDENNICKNAME_MSG "432 %s %s :Nickname is forbidden/blocked"
#define ERR_NICKNAMEINUSE_MSG "433 %s %s :Nickname already in use"
+#define ERR_UNAVAILRESOURCE_MSG "437 %s :Cannot change nickname while on %s(+N)"
#define ERR_USERNOTINCHANNEL_MSG "441 %s %s %s :They aren't on that channel"
#define ERR_NOTONCHANNEL_MSG "442 %s %s :You are not on that channel"
#define ERR_USERONCHANNEL_MSG "443 %s %s %s :is already on channel"